Did you happen to know that vinegar is a homemade organic weed killer that won't damage your soil or surrounding plants. This would be the best if you purchased several gallons of vinegar.

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You'll need to cut the plant down to the root ball, dig around the root ball and add your vinegar. This should do the trick and kill the roots of the plants and any new growth that the plants are producing.

I live in the Pacific NW and we are always fighting blackberries. You have to dig them up if you are not going to use any type of poison. What I would recommend is to cut it off at the ground level whenever you see any new growth.

When the blueberry growing season is done, I would carefully dig up the blueberry bushes, remove the blackberry root and then replant.